Interview PrepLLD

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LLDSystem Design

Low-Level Design & Design Patterns

0% read0 of 89 topics

LLD Foundations0/4

What is Low Level Design?Soon

HLD vs LLDSoon

What Interviewers Expect in an LLD RoundSoon

How to Approach Any LLD Problem (Requirements → Entities → Relationships → Code)Soon

Object-Oriented Programming0/8

Classes and ObjectsSoon

EncapsulationSoon

AbstractionSoon

InheritanceSoon

Polymorphism (Overloading vs Overriding)Soon

Interfaces vs Abstract ClassesSoon

Composition vs InheritanceSoon

Access Modifiers and ImmutabilitySoon

Relationships Between Classes0/6

AssociationSoon

AggregationSoon

CompositionSoon

DependencySoon

Inheritance (Is-A vs Has-A)Soon

Choosing the Right RelationshipSoon

UML Diagrams0/7

Why UML?Soon

Class DiagramsSoon

Showing Relationships in Class DiagramsSoon

Sequence DiagramsSoon

Use Case DiagramsSoon

Activity and State DiagramsSoon

Drawing Diagrams in an InterviewSoon

SOLID Principles0/7

Why Design Principles Matter Single Responsibility Principle (SRP)10 min Open/Closed Principle (OCP)10 min Liskov Substitution Principle (LSP)10 min Interface Segregation Principle (ISP)10 min Dependency Inversion Principle (DIP)10 min SOLID Violations and How to Fix Them10 min

Other Design Principles0/7

DRY (Don't Repeat Yourself)Soon

KISS (Keep It Simple)Soon

YAGNI (You Aren't Gonna Need It)Soon

Favor Composition Over InheritanceSoon

Program to an Interface, Not an ImplementationSoon

Law of DemeterSoon

High Cohesion, Low CouplingSoon

Creational Design Patterns0/6

What Are Design Patterns?Soon

Singleton10 min Factory Method10 min

Abstract FactorySoon

BuilderSoon

PrototypeSoon

Structural Design Patterns0/7

AdapterSoon

DecoratorSoon

FacadeSoon

ProxySoon

CompositeSoon

BridgeSoon

FlyweightSoon

Behavioral Design Patterns0/10

StrategySoon

ObserverSoon

CommandSoon

StateSoon

Template MethodSoon

Chain of ResponsibilitySoon

IteratorSoon

MediatorSoon

MementoSoon

VisitorSoon

Concurrency in LLD0/6

Threads and Shared StateSoon

Race ConditionsSoon

Locks and SynchronizationSoon

Thread-Safe SingletonSoon

Producer-Consumer ProblemSoon

Designing Thread-Safe ClassesSoon

Machine Coding Problems (Easy)0/6

Parking LotSoon

Tic-Tac-ToeSoon

Snake and LadderSoon

Vending MachineSoon

Library Management SystemSoon

Logger SystemSoon

Machine Coding Problems (Medium)0/8

Elevator SystemSoon

ATM SystemSoon

BookMyShow (Movie Ticket Booking)Soon

Splitwise (Expense Sharing)Soon

Rate LimiterSoon

LRU CacheSoon

Notification SystemSoon

Hotel Management SystemSoon

Machine Coding Problems (Hard)0/7

Chess GameSoon

Food Delivery App (Swiggy/Zomato)Soon

Ride Sharing App (Uber)Soon

Online Shopping Cart (Amazon)Soon

Stock Exchange / Order MatchingSoon

Distributed Task SchedulerSoon

Pub-Sub Messaging SystemSoon

Classes and Objects

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